I think this is the best way to do it if you wanted to be honest and safe, plus if the guys at the maintenance yard know you forge stuff they might have other metal that you can have (at the yard or at home), you could end up with some pretty nice metal since most people dont know what they have and will gladly give you their "junk" to make the wife happy lol. but back on topic, some materials that i started with are rebar( i know some people frown on rebar but for practicing i have never had a problem with it), RR spikes, small axle shafts from a gokart,leaf springs, used mower blades, metal from home depot etc etc. if you ask around you can find almost anything. One thing you have to remember is that if you never ask the answer is always NO. you can always ask your mechanic if he will let you have springs,torsion bars and axle shafts or whatever else you could use off of a vehicle and you can always ask a scrap yard if they sell. calling up a steel yard is also a good place to get beginner materials, the owner or person in charge will always be glad to sell you drops.